【作者】 陈辉； 窦森；

【Author】 CHEN Hui DOU Sen (College of Resources and Environment,Jilin Agricultural University,Changchun 130118,China)

【机构】 吉林农业大学资源与环境学院；

【摘要】 秸秆还田是土壤有机培肥的一项重要农业措施,大量研究表明施用秸秆能明显改善土壤的物理化学性质。从物理和化学结合的角度,为了进一步明确施用秸秆后团聚体中腐殖质数量的变化情况,本文运用团聚体分组和腐殖质化学分组相结合的方法,对长期定位施肥试验田分别取不施肥和施用玉米秸秆2个处理的土壤进行了分析和测定。结果表明:土壤团聚体的含量随着粒级的减小呈先增加后降低的趋势,2～0.25mm和0.25～0.053mm为优势粒级,团聚体各粒级的腐殖质C和N含量均随粒级的减小而逐步降低。长期施用玉米秸秆使各粒级的C、N含量增加。玉米秸秆施用后团聚体中HS的ΔlgK比值均提高,其中2～0.25 mm粒级HA、FA与0.25～0.053mm粒级HMc的ΔlgK值降低,结构变复杂。更多还原

【Abstract】 Stalk is an important part of soil organic fertilizing agricultural practices.A large number of studies have shown that application of stalk can improve the soil physical and chemical properties,From the perspective of physics and chemistry combined,In order to further clarify the application of stalk humus aggregates after the number of changes,In this paper,aggregate packet and humus chemical method of combining grouping Of long-term fertilization experimental field no fertilizer and Corn stalks 2 treatment of soil were analyzed and determined.The results showed that the aggregate contents firstly increased and then decreased with the increase of aggregate size.2～0.25mm and 0.25～0.053mm aggregates were dominant.Aggregates of various size fractions of humus C and N content of the decrease of grain size with the gradually reduce.Long-term application of corn stalks to make the grain size of the C,N content increased.Corn stalks after applying aggregates HS,△lgK ratios are improving.Of which 2～0.25 mm grain size HA,FA and 0.25～0.053mm low values of grain size HMc△lgK,Structure of the complex variable.更多还原